Choice (A) is correct. “Personification” is the attribution of human qualities to an object or abstraction. Nature, the boat, and the mountain echoes are all personified to some degree in lines 1-7. The speaker first refers to nature as “her” (“led by her”), then calls the cave the boat’s “home” and refers to the boat as “her” (“unloosed her chain”), and finally refers to “the voice/Of mountain echoes.” The speaker’s words subtly convey the impression that nature, the boat, and the mountain echoes are like human characters in the episode and are not merely things.